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首页> 外文期刊>Journal of Electrical & Electronics Engineering, Australia >Determination of Critical Clearing Time Through Evaluation of Machine Kinetic Energy and its Derivative
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Determination of Critical Clearing Time Through Evaluation of Machine Kinetic Energy and its Derivative

机译：通过评估机器动能及其导数确定临界清除时间

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摘要

This paper proposes a method of determining the critical clearing time, for a given fault on a power system, by evaluating the kinetic energy and its derivative of a particular machine referred to as the critical machine. The critical machine is considered to be the one that initiates the instability and it is identified by checking the variation of the derivative of machine kinetic energies. The transient stability limit of the critical machine, and hence the critical clearing time, is determined by comparing the kinetic energy of the machine and the area under the derivative of kinetic energy curve. The faulted system states required in calculating the kinetic energy and its derivative are estimated by multi-step Taylor series expansions. The proposed method was tested on the 7-machine CIGRE system and the 20-machine IEEE test system for a number of fault conditions. Results obtained by the proposed method were compared with the corresponding actual values found by the step-by-step method and were observed to be in excellent agreement.
机译：本文提出了一种通过评估特定机器（称为关键机器）的动能及其导数来确定电力系统给定故障的关键清除时间的方法。关键机器被认为是引发不稳定性的机器，它通过检查机器动能导数的变化来确定。通过比较机器的动能和动能曲线的导数下的面积，可以确定关键机器的暂态稳定性极限，进而确定关键清除时间。通过多步泰勒级数展开来估算计算动能及其导数所需的故障系统状态。针对多种故障情况，在7机CIGRE系统和20机IEEE测试系统上对提出的方法进行了测试。通过提议的方法获得的结果与通过逐步方法发现的相应实际值进行了比较，并且观察到非常一致。

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